NIA X2 4-in-1 Bluetooth Hands-free Headphone Support Micro SD Player / FM Radio / 3.5mm Cable - Black 4-in-1 functions: Bluetooth headphone + Micro SD/TF player + FM radio + 3.5mm cable connection Enjoy music wirelessly from Bluetooth Stereo-enabled music players and mobile phone... NIA X2 4-in-1 Bluetooth Hands-free Headphone Support Micro SD Player / FM Radio / 3.5mm Cable - Black 4-in-1 functions: Bluetooth headphone + Micro SD/TF player + FM radio + 3.5mm cable connection Enjoy music wirelessly from Bluetooth Stereo-enabled music players and mobile phone Bluetooth V4.0 for high quality audio with less interference and lower power consumption Built-in microphone allows for hands-free call experience Can play music files from Micro SDHC/TF card directly (cards not included) Support FM radio function, enriching your music enjoyment 3.5mm cable connection allows you to listen music from most of audio devices (cable not included) Basic remote control operation (play, stop, etc) via Bluetooth connection (required to support A2DP/HFP or HSP/AVRCP) Foldable design for easy and convenient storage Specification: Bluetooth version: V4.0 Compatible Bluetooth profiles: A2DP, AVRCP, HSP, HFP Operation distance: 10m Sensitivity: 108±3dB Frequency response: 20Hz-20KHz Speaker size: ø40mm Speaker impedance: 32Ω Charging time: about 2 hours Compatible with: iPhone series iPad series Samsung, Sony, HTC, Huawei, etc. smartphones and tablets MP3/MP4 Other audio devices Package included: 1 x NIA X2 4-in-1 Bluetooth Hands-free Headphone Support Micro SD Player / FM Radio / 3.5mm Cable - Black 1 x Micro USB Cable (about 20cm) 1 x User Manual